Photographic camera



Aug. 15, 1939. I H. FROTSCHNER PHOTOGRAPHIC CAMERA 2 Sheets-Sheet 1 Filed Nov. 25, 1936 WHEEFHW Aug. 15, 1939. H. FROTSCHNER 2,169,638

PHOTOGRAEHIC CAMERA Filed Nov. 231936 I 2 SheetsSheet 2 Patented a... 15, 1939 I 2,169,688

" UNITED STATES PATENT, OFFICE- PHOTOGRAPHIO CAMERA Hellmuth Friitschner, Dresden-Lanbegast, Germany, assignor to Zelss Ikon -Aktiengesellschaft, Dresden, Germany Application November 23, 1936, Serial No. 112,382

Germany November 26, 1935 6 Claims.- 01. 95-64) The invention relates to improvements in Fig. 3 is a diagrammatic side elevation view of photographic cameras and particularly pertains a reflex camera provided with the polarizer arto means for eliminating disturbing light reflecrangement of the invention, the polarizers being tions when taking photographic pictures. a shown in vertical section. I

It is well known that light reflected onto non- In Figs. 1 and 2 the camera casing l supports 5 metallic surfaces is partially polarized. Thereon its front wall 2 the lens system 3. A finder fore, it is possible to eliminate to a certain degree lens 4 is arranged just inside the front wall 2, the disturbing reflections when photographing behind a suitable opening in the latter, and'is bright objects by arranging a light polarizing filadapted to be observed through an opening I in ter in front of the photographic lens system. Inthe rear wall 6 of the casing i. 10

deed, it has been proposed heretofore to employ In front of the finder lens 4 is arranged a polarlight polarizing means for eliminating reflections izer I secured in a mounting I which is rotatably or for improving the illumination with laterally supported on the outer face of the front wall 2 of arranged extensive reflecting surfaces. There are the camera casing I. The polarizer mounting I now available light polarizing means in the form 8 has secured thereto a gear 9 meshing with a gear 15 of cemented discs and foils which very conl0 loosely supported at H on the front wall 2 of u veniently may be arranged in front of the lens the casing i and in turn meshing with'an annular system of the camera. The correct position of gear I2 which rotatably surrounds the lens systhe light polarizing means with respect to the tem 3. The annular gear l2 engages a gear I3 camera is determined by'observing the object to fixedly secured on a shaft I, which is rotatably 2o be photographed through the light polarizing supported by the camera casing I and projects means and thereby rotating the latter. outwardly therefrom to terminate adjacent the It is now an object of the invention. to adjust front end of the lens system 3. A second polarthe light polarizing means simultaneously with izer I5 is mounted rotatably on the front end the adjustment of the picture area in the finder, of the lens system 3 by means of a mounting I6 25 for which purpose a light polarizing means is which latter is provided with gear teeth I! meshmounted on or in the finder. ing with a gear l9 fixed on the front end of the A further object of the invention is to provide shaft 14. It will thus be obvious, that upon roa camera with two similar polarizers, whose tation of one polarizer the other one will be siplanes of polarization are parallel to each other, multaneously rotated due to the operative con- 30 namely, one polarizer for-the finder and one for nection between the polarizer mountings 8 and II. the lens system and means for operatively con- Fig. 3 illustrates diagrammatically the arrangenecting said two polarizers, so that upon adjust ment of polarizers on a reflex camera 20 provided I ment of one polarizer the other is simultaneously with a, finder lens system 2| positioned directly adjusted, thereby dispensing with the necessity above the photographic lens system 22. The 35 of ad a s a on one p i r a adj n polarizer 23 in front of the finder lens system 2| the second analyzer in accordance with the scale i Secured i a mounting 24 prgvided t reading of the first one. ternal teeth 25 meshing with a gear 20 which with these and other objects in view the invenalso meshes with external teeth 21 on a mounttion resides in certain improvements, arrangeing 28 which has securedtherein the polarizer 40 ments and combinations of parts, as will be here- 29 arranged in front of the photographic lens inafter described in connection with the accomsystem 22. Both mountings 24 and 28 are ropanyins drawin s, the novel features being tatably supported by a common casing 30 adapted pointed out in the claims at the end of this to be attached and supported by the mounting 5 specification: or mountings of one or both of the lens systems 5 In the drawings: v 2| and/or 22. This casing 3| surrounds both Fig. 1 is a diagrammatic front elevation view p l r r mountings 8nd 3. including their of a photographic camera illustrating one emgear teeth 25 and 21. Only the teeth 25 of the bodiment of the invention, namely the arrangeupper polarizer 23 which is positioned in front of ment of two polarizers in front of the lens sys-' the finder lens, system 2| are made accessiblefor 5o tem'and finder respectively. a manual actuation through a recess 22 in the Fig. 2 is a diagrammatic top'plan view of the upper portion of the housing 30. In this last decamera illustrated in- Rigii l, a portion being scribed embodiment of the invention, upon shown in horizontal sectlonto disclose the finder manual operation of the upper polarizer 23 the which is mounted in the camera casing, and lower one positioned in front of the photographic 55 lens system 22 is simultaneously rotated the same extent due to the operative connection 25, 28, it

in front of said finder, a second light polarizing means in front of said camera objective, said two polarizing means having their planes of polarization parallel to each other and being rotatably adjustable about the axis of said'finder and camera objective respectively, and means for operatively connecting said polarizing means with each other, and being effective upon rotative adjustment oi. one said polarizing means to adjust the other in the same direction the same angular distance.

2.In combination-in a camera, a camera, objective, a finder, a light polarizing means mounted in front ofsaid finder, a second light polarizing means in front of said camera objective, said two polarizing means having their planes of polariization parallel to each other and being rotatably adjustable about the axis or said finder and camera objective respectively, and means including two gears; one for each said polarizing meansand at least one gear meshing with both said two gears .for operativel'y connecting said polarizing means with each other, and being effective upon rotative adjustment of one said polarizing means to adjust the other in the same direction the same angular distancel l 3. In combination-in a camera, a camera .objective, a finder, a light polarizing means in front of said finder, a second light polarizing means mounted in front of said camera objective, said two light polarizing means having their planes of polarization parallel to each other and being rotatably adjustable about the axis of said finder and camera objective respectively, each said light polarizing means including an annular mounting provided with gear teeth, and a gearing operatively connecting said annular mountings with each other and adapted upon rotative adjustment of either one of said polarizing means to adjust the other in the same direction the same angular distance.

4. In combination in a camera, a camera objective, a mounting for said objective, a finder, a light polarizing means in Iront of said finder,

a second light polarizing means in front of said camera objective, said two light polarizing means.

having their planes of polarization parallel to each other and being rotatably adjustable about the. axis of said finder and camera objective respectively, a casing detachably mounted on the mounting of [said camera objective and in which both said polarizing means are rotatably supported, and means in said casing for operatively connecting said polarizing means with each other and eilective upon rotative adjustment of one of said polarizing means to adjust the other simultaneously in the same direction the same angular distance.

5. In combination in a camera, a camera objective, a mounting for said objective, a finder, a light polarizing means in front of said finder, asecond light polarizing means in front of said camera objective, said two light polarizing means having their planes of polarization parallel to each other and being rotatably adjustable about the axis of said finder and camera objective re-= spectively, a casing detachably mounted on the mounting of said camera objective and in which both said polarizing means are rotatably supported, and a gear rotatably mounted in said casing and drivingly connecting both polarizing} means with each other and effective upon rotative adjustment of one of said polarizing means to adjust the other simultaneously in the same direction, the same angular distance..-

6. In combination in a camera, a camera objective, amounting for said objective, a finder,

a light polarizing means in front of said finder,

a second lightpolarizing means in front of said camera objective, said two light polarizing means having their planes of polarizationparallel to each other and being rotatably adjustable about the axis of said finder and camera objective respectively, a casing detachably mounted on the mounting of said camera objective and in which both saldpolarizing means are rotatably supported, and means in said casing for operatively connecting said polarizing means with each other and effective upon rotative adjustment of the polarizing means in front of said finder to adjust the other polarizing means arranged in front of the camera objective in the. same direction the same angular distance.

HEIJMU'I'H r'nb'rsomma. 

